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A031683 Numbers n such that continued fraction for sqrt(n) has odd period and central term 95. 0
56669, 110938, 183265, 184981, 274697, 508594, 512881, 653153, 656389, 659633, 664514, 824825, 828461, 1195178, 1203938, 1214933, 1217138, 1411969, 1419106, 1421489, 1426261, 1433434, 1435829, 1438226, 1659673, 1669993, 1899725 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

MATHEMATICA

cf95Q[n_]:=Module[{s=Sqrt[n], cf, len}, cf=If[IntegerQ[s], {1, 1}, ContinuedFraction[ s][[2]]]; len=Length[cf]; OddQ[len]&&cf[[(len+1)/2]] == 95]; Select[Range[2*10^6], cf95Q] (* Harvey P. Dale, Aug 11 2015 *)

CROSSREFS

Sequence in context: A329270 A190836 A288076 * A202568 A145685 A333951

Adjacent sequences:  A031680 A031681 A031682 * A031684 A031685 A031686

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

Corrected and definition clarified by Harvey P. Dale, Aug 11 2015

STATUS

approved

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Last modified April 14 12:11 EDT 2021. Contains 342949 sequences. (Running on oeis4.)